Two No Trumps

OCP does not use a "classic" Precision Opening (strong balanced) because all of our strong balanced ranges are already catered for. Rather, OCP uses it as either a weak pre-emptive Opening with at least 5-5 in the Minors (in ACBL or EBU jurisdiction), or a Multi-style Opening (anywhere else or on BBO) with either:
  1. 5-9 points and at least 5-5 in the Minors, or
  2. 11-15 and exactly 5-5 in the Majors, or
  3. A 3-level pre-empt in Clubs

These two related methods are set out below.

2NT = Minor 2-suiter

There is no need for a complicated scheme of responses to a 2NT Opening that always shows a weak Minor 2-suiter. The below gives us the ability to compete, invite, bid game or investigate Slam in either Minor, and so to sign off in game in some other denomination:
2NT -3 is to play
-3 is to play
-3 is Gamma in Clubs. Asking Bids established.
-3 is Gamma in Diamonds. Asking Bids established.
-3NT is strictly to play.
-4 is natural and invitational with a good Club fit
-4 is natural and invitational with a good Diamond fit
-4 is natural and "to play" with a very strong hand and at least a 7-card Heart suit
-4 is natural and "to play" with a very strong hand and at least a 7-card Spade suit
-5 To play and probably pre-emptive
-5 To play and probably pre-emptive

2NT = Multi-style

The general strategy behind the Responses contains some elements of Oliver's Twist, as follows:
2NT -3 shows a preference between the Minors. Now:
-Pass shows both Minors or a Club Pre-empt
-3 shows both Majors, upper range. Now:
-3/4 is 100% "to play"
-3/4 is 100% "to play"
-3NT is 100% "to play"
-4 is Gamma in Hearts. Asking Bids established.
-4 is Gamma in Spades. Asking Bids established.
-3 shows both Majors, lower range. Now:
-No/4 is 100% "to play"
-3/4 is 100% "to play"
-3NT is 100% "to play"
-4 is Gamma in Hearts. Asking Bids established.
-4 is Gamma in Spades. Asking Bids established.
2NT -3 shows a preference between the Minors. Now:
-Pass shows both Minors
-3 shows both Majors, any range. Now:
-3/4 is 100% "to play"
-3NT is 100% "to play"
-4 is Gamma in Hearts. Asking Bids established.
-4 is Gamma in Spades. Asking Bids established.
-4 is 100% "to play"
-3NT shows the Club Pre-empt
-Pass/4 Responder passes or corrects
2NT -3 shows a strongly invitational hand with Hearts and a Minor. Now:
-Pass shows a minimum hand with both Majors
-3NT shows the Club Pre-empt. Responder passes or corrects to 4/5
-No/4/5 Responder passes or corrects
-4 shows the weak Minor 2-suiter, any range
-No/5 Responder passes or raises with good Club support
-4/5 Responder passes or raises with good Club support
-4 shows the Major 2-suiter, better than minimum
2NT -3 shows a strongly invitational hand with Spades and a Minor. Now:
-Pass shows a minimum hand with both Majors
-3NT shows the Club Pre-empt. Responder passes or corrects to 4/5
-No/4/5 Responder passes or corrects
-4 shows the weak Minor 2-suiter, any range
-No/5 Responder passes or raises with good Club support
-4/5 Responder passes or raises with good Club support
-4 shows the Major 2-suiter, better than minimum
2NT -3NT shows a strong balanced hand that wants to be in 3NT Opposite a Club Pre-empt of weak Minors, or in game/slam opposite a Major 2-suiter
-4 shows the Major 2-Suiter. Now:
-4 is a range/distribution enquiry.
-4 shows any minimum hand. Responder passes or converts, or may bid 4NT as Beta
-4 shows maximum with a Diamond singleton. 4NT is Beta.
-4NT shows maximum with a Club singleton. 5♣ is Beta.
-5 shows maximum with a Diamond void. 5 is Beta.
-5 shows maximum with a Club void. No Beta permitted.
-4 shows the Minor 2-Suiter, minimum range. 4 is Beta.
-4 shows the Minor 2-Suiter, maximum range with a Spade shortage. 4 is Beta.
-4♠ shows the Minor 2-Suiter, maximum range with a Heart shortage. 4NT is Beta.
2NT -4 shows a strong distributional hand interested in a game or slam opposite either of the hand types (eg: a strong 2-suiter with one Major and one Minor with at least a good tolerance for Clubs)
-4 shows the Major 2-Suiter. Now:
-4 Shows preference for Hearts, but no interest in more than game
-4 Shows preference for Spades, but no interest in more than game
-4NT is Gamma in Hearts. Asking Bids are established.
-5 is Gamma in Spades. Asking Bids are established.
-4 shows the Minor 2-Suiter. Now:
-4 is Gamma in Clubs. Asking Bids are established.
-4NT is Gamma in Diamonds. Asking Bids are established.
-5 To play. Shows no interest in more than game in Clubs
-5 To Play. Shows no interest in more than game in Diamonds
-4NT shows the Club pre-empt. All continuations are natural.

Notes

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